PySpark DataFrame Transformations — Interview Workbook Generated: 2025-08-15 16:49:45 This notebook is a hands-on interview prep guide covering the most common DataFrame transformations in PySpark, with: You can run this…
I’ll also give extra deep-dive questions that interviewers love to ask to test both hands-on skills and conceptual clarity. 1. Filtering Definition: Select rows from a DataFrame based on a…
An Executor in Apache Spark is one of the fundamental building blocks of Spark’s distributed computing architecture. It is responsible for executing the code assigned to it by the Driver…
To properly allocate driver and executor memory in Apache Spark, you need to understand how memory is managed and how to set the appropriate parameters for your environment. Here’s a…
In-memory processing in Apache Spark refers to the ability of the framework to process data entirely in memory, rather than relying on disk storage. This approach makes Spark much faster…
n Apache Spark, the foreach() operation is considered an action because it triggers the actual execution of the Spark job and produces side effects, such as writing data to external…
To display the contents of a DataFrame in Spark, you can use the show() method, which prints a specified number of rows in a tabular format. Below is a detailed…
In Apache Spark, shared variables are variables that can be shared across multiple nodes in the cluster and are used to coordinate tasks. These variables are often required in certain…
Fault Tolerance in Apache Spark Apache Spark is designed to be fault-tolerant, ensuring that it can recover from failures without losing data or interrupting computations. Fault tolerance is critical for…
In Apache Spark, an Action is a type of operation that triggers the execution of a Spark job. Actions are operations that produce a result or output, and they cause…
Darshini